Question

A solar sail is made of aluminized Mylar having an emissivity of
0.03 and reflecting 97% of the light that falls on it. Suppose a
sail with area 1.10 km2 is oriented so that sunlight falls
perpendicular to its surface with an intensity of 1.40 103 W/m2. To
what temperature will it warm before it emits as much energy (from
both sides) by radiation as it absorbs on the sunny side? Assume
the sail is so thin that the temperature is uniform and no energy
is emitted from the edges. Take the environment to be 0 K. (s =
5.6696 10-8 W/m2·K4)
___________________ K